<template>
  <div class="singleImageUpload2 upload-container">
    <el-upload
      :data="dataObj"
      :multiple="false"
      :show-file-list="false"
      :on-success="handleImageSuccess"
      class="image-uploader"
      drag
      action="https://httpbin.org/post"
    >
      <i class="el-icon-upload" ></i>
      <div class="el-upload__text">
        Drag或<em>点击上传</em>
      </div>
    </el-upload>
    <div v-show="imageUrl.length>0" class="image-preview">
      <div v-show="imageUrl.length>1" class="image-preview-wrapper">
        <img :src="imageUrl" />
        <div class="image-preview-action">
          <i class="el-icon-delete" @click="rmImage" ></i>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { getToken } from '/vue/api/qiniu.js'

module.exports = {
  name: 'SingleImageUpload2',
  props: {
    value: {
      type: String,
      default: ''
    }
  },
  data() {
    return {
      tempUrl: '',
      dataObj: { token: '', key: '' }
    }
  },
  computed: {
    imageUrl() {
      return this.value
    }
  },
  methods: {
    rmImage() {
      this.emitInput('')
    },
    emitInput(val) {
      this.$emit('input', val)
    },
    handleImageSuccess() {
      this.emitInput(this.tempUrl)
    },
    beforeUpload() {
      const _self = this
      return new Promise((resolve, reject) => {
        getToken().then(response => {
          const key = response.data.qiniu_key
          const token = response.data.qiniu_token
          _self._data.dataObj.token = token
          _self._data.dataObj.key = key
          this.tempUrl = response.data.qiniu_url
          resolve(true)
        }).catch(() => {
          reject(false)
        })
      })
    }
  }
}
</script>

<style scoped>
	.upload-container {
		width: 100%;
		height: 100%;
		position: relative;
	}

		.upload-container .image-uploader {
			height: 100%;
		}

		.upload-container .image-preview {
			width: 100%;
			height: 100%;
			position: absolute;
			left: 0px;
			top: 0px;
			border: 1px dashed #d9d9d9;
		}

			.upload-container .image-preview .image-preview-wrapper {
				position: relative;
				width: 100%;
				height: 100%;
			}

				.upload-container .image-preview .image-preview-wrapper img {
					width: 100%;
					height: 100%;
				}

			.upload-container .image-preview .image-preview-action {
				position: absolute;
				width: 100%;
				height: 100%;
				left: 0;
				top: 0;
				cursor: default;
				text-align: center;
				color: #fff;
				opacity: 0;
				font-size: 20px;
				background-color: rgba(0, 0, 0, 0.5);
				transition: opacity .3s;
				cursor: pointer;
				text-align: center;
				line-height: 200px;
			}

				.upload-container .image-preview .image-preview-action .el-icon-delete {
					font-size: 36px;
				}

			.upload-container .image-preview:hover .image-preview-action {
				opacity: 1;
			}

</style>
